PLATE H. 
Bellati 
Microphone. 
Cuning- fork. 
Accumulator. 
Microphone. | | 
—c 
foceedings Royal Acad. Amsterdam. Vol. IV. 
Battery 
J. W. GILTAY. „The effect of the induction-coil in telephonic apparatus: u.) 
Sm 
Battery. Amp. metre. 
I50 
900 
Sin. x1000 
EN 
IN 
Sn 
OLAZ OA AF 25) 26 OF O8 AIO NN LA 43 14 
Fig. 6. 
Amp. metre 
Bellatr = 15A {D- 7 Accumulator. 
ce a 
De — 
Microphone | 
5 s 
YU. 
fig. 8. 
/A 
